1 Peter 3:7 - Likewise, ye husbands, dwell with them according to knowledge, giving honour unto the wife, as unto the weaker vessel, and as being heirs together of the grace of life; that your prayers be not hindered
KJV

Matthew 18:19 - (Paraphrased) I also tell you this-if two of you agree down here on earth concerning anything you ask for, my Father in heaven will do it for you.

This is the Key to the BLESSINGS. Man and Woman should agree in anything. To agree is to be in harmony to concur or simply to say yes.

So many times couples failed in this area, we can't blame them, because of our differences, the way we were raised by our own parents or because of our culture and the diffrences of our faith.

The first few months or years of marriage a little bit easier, we can still feel the respect of both because were still trying to have reservation of ourselves but in the long run when we're already familiar to each other, the word "I don't Care" often becomes expression. Not knowing that this leads to not minding each other.

This is the reason why we're reminded to AGREE because our saying is always mind your own business.

Love and Respect are the actions should be seen and feel that makes the couple agree and stay together. 

There are times although it will hurt both parties, NOT TO AGREE,  when the love of life knows that it will ruin the life of the partner.  To disagree for your good is a blessing.

Why there are couples end up in divorce or separated.  The reason is they agree they don't need each other any more, they agree not to mend their situation.

We can enumerate who's fault it is, how huge is the damage IF the couple Agree, decided to MEND their life with the HELP of the ALMIGHTY both LIFE will be BLESSED.